I'm experiencing the same bug, karmic x64, tons of ssh zombies.
Happens with interactive and non-interactive shells, and with ssh tunnels.
if i restarts the main sshd, it works for a little while, then starts
leaving zombies behind.
My shell is tcsh (doesn't seem to matter though).
If i strace the main sshd while doing a "ssh server echo '$$'", i see:
28640 write(1, "28640\n", 6) = 6 <=== my echo
28640 rt_sigprocmask(SIG_SETMASK, NULL, ~[INT KILL ALRM TERM CHLD STOP RTMIN
RT_1], 8) = 0
28640 rt_sigprocmask(SIG_SETMASK, ~[KILL ALRM TERM CHLD STOP RTMIN RT_1], NULL,
8) = 0
28640 close(0) = 0
28640 close(1) = 0
28640 close(2) = 0
28640 rt_sigprocmask(SIG_SETMASK, NULL, ~[KILL ALRM TERM CHLD STOP RTMIN RT_1],
8) = 0
28640 rt_sigprocmask(SIG_SETMASK, ~[INT KILL ALRM TERM CHLD STOP RTMIN RT_1],
NULL, 8) = 0
28640 exit_group(0) = ? <=== the
shell exits properly
28639 <... select resumed> ) = 1 (in [11])
28639 rt_sigprocmask(SIG_BLOCK, [CHLD], ~[KILL ALRM STOP RTMIN RT_1], 8) = 0
28639 rt_sigprocmask(SIG_SETMASK, ~[KILL ALRM STOP RTMIN RT_1], NULL, 8) = 0
28639 read(11, "28640\n", 16384) = 6
28639 select(14, [3 7 11 13], [3], NULL, NULL) = 3 (in [11 13], out [3])
28639 rt_sigprocmask(SIG_BLOCK, [CHLD], ~[KILL ALRM STOP RTMIN RT_1], 8) = 0
28639 rt_sigprocmask(SIG_SETMASK, ~[KILL ALRM STOP RTMIN RT_1], NULL, 8) = 0
28639 read(11, "", 16384) = 0
28639 close(11) = 0
28639 read(13, "", 16384) = 0
28639 close(13) = 0
28639 write(3,
"\315\300.\216\6\313\\\303\360\304\324*\355\332\222\373\266\275\255\275\t\261\",\325\205\3432\25\355\26\214"...,
48) = 48
28639 select(14, [3 7], [3], NULL, NULL) = 1 (out [3])
28639 rt_sigprocmask(SIG_BLOCK, [CHLD], ~[KILL ALRM STOP RTMIN RT_1], 8) = 0
28639 rt_sigprocmask(SIG_SETMASK, ~[KILL ALRM STOP RTMIN RT_1], NULL, 8) = 0
28639 write(3,
"\202T\314[\351\244\33\22\245\361\302NI=Yv\35\375\311h\25\275\272\255fbzH\365\244\247n",
32) = 32
28639 select(14, [3 7], [], NULL, NULL <== the forked sshd expects
something from fd 3 or 7 but it never happens
** Changed in: openssh (Ubuntu)
Status: Incomplete => Confirmed
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sshd zombie processes and strange behavior after karmic upgrade
https://bugs.launchpad.net/bugs/407428
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